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Sierra Management Group: data breach filings, state by state

Sierra Management Group has 2 data breach filings on record in 2 government portals. The latest was reported to California AG on Jun 29, 2026. Data exposed, as filed: Postal address, Medical / health information.

1,279people in total, as reported to HHS OCR on Jun 7, 2026
2filings in 2 government portals
Jun 29, 2026latest filing, California AG

By portal

PortalFilingsLatest reportPeople in the latest filing
California AG1Jun 29, 2026Not published
HHS OCR1Jun 7, 20261,279 in total

Counts are the organization's own, as filed with each agency. Most state portals count their own residents only, so no single state shows the whole incident. An organization can file more than once for the same incident, and for different ones.

Case file

Breach window
Jun 3, 2026
Discovered
Jun 3, 2026, as stated in the California letter
Offered to those affected
credit or identity monitoring through Experian (term not stated in the letter we read)
Third party named
Yes, the letter attributes the incident to a vendor or service provider
Days to notice
Within the statutory period in California, counted from discovery to the state's first record

Open the case fileWord document

Every filing with the agency links, each state's record against its statutory period with the citation, what the letter offers, prior incidents. Letter facts are quoted so you can check them.

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Every filing

OrganizationSourceStateReportedResidents affectedData exposed
Sierra Management Group California AG CA Jun 29, 2026 Not published Postal addressName
Sierra Management Group HHS OCR US Jun 7, 2026 1,279 Medical / health information

Data reproduced from public government filings. Each row opens the record with the agency link. Spot an error? Email support@breachtally.com with the page link. Corrections are applied and noted.